I'm not sure exactly what you're looking to make. If you don't have anything particular in mind, you could just try searching "goth" or "gothic" on a pattern site such as Ravelry.com. To see patterns on Ravelry you have to sign up, but it's free and only takes a minute.
I did a quick search on Ravelry and came up with a few interesting patterns for a variety of things (wrist warmers, socks, shawls, etc). Click hereto check out my search results, or try searching using different keywords.